Method and system of distinguishing between human and machine

A system comprising:

• a recording module used for, when a request for accessing a designated network service is received, recording information of the request which include a time of receipt of the request and information of an access object that sends the request;
• a computation module used for computing a statistical value of requests sent by the access object in real time based on a record;
• and
• a determination module used for determining the access object to be abnormal in response to the statistical value of the requests sent by the access object exceeding a predetermined normal range.

One or more computer-readable media storing executable instructions that, when executed by one or more processors, cause the one or more processors to perform acts comprising:

• each time when a request for accessing a designated network service is received, recording information of the request which include a time of receiving the request and information of an access object that sends the request;
• computing a statistical value of requests sent by the access object based on a record;
• and
• determining the access object to be abnormal in response to the statistical value of the requests sent by the access object falling outside a predetermined normal range.